Kubernetes 1.8 reference docs (#5632)

* Kubernetes 1.8 reference docs

* Kubectl reference docs for 1.8

* Update side bar with 1.8 kubectl and api ref docs links

docs/api-reference/v1.8/node_modules/optimist/example/default_hash.js

@@ -0,0 +1,8 @@
+#!/usr/bin/env node
+
+var argv = require('optimist')
+    .default({ x : 10, y : 10 })
+    .argv
+;
+
+console.log(argv.x + argv.y);